The 17272 Foot Grounders provide contact with the ESD floor both under the foot's sole as well as the heel area, providing a more continuous and reliable path-to-ground. These foot grounders are easier to install than most foot grounders and are designed for use on standard shoes. The snug, reliable fit can be easily adjusted to fit the individual wearer. These foot grounders are made from non-marring three layer high visibility yellow reversible static dissipative rubber with a black conductive inner layer. They are UL listed.